Spin and orbital hybridization at specifically nested Fermi surfaces in URu$_2$Si$_2$

Peter M. Oppeneer; Saad Elgazzar; Jan Rusz; Qingguo Feng; Tomasz Durakiewicz; John A. Mydosh

doi:10.1103/PhysRevB.84.241102

paper

Spin and orbital hybridization at specifically nested Fermi surfaces in URu $_{2}$ Si $_{2}$

arXiv:1110.0981 · doi:10.1103/PhysRevB.84.241102

Abstract

The Fermi surface (FS) nesting properties of URu $_{2}$ Si $_{2}$ are analyzed with particular focus on their implication for the mysterious hidden order phase. We show that there exist two Fermi surfaces that exhibit a strong nesting at the antiferromagnetic wavevector, $Q_{0}$ =(0,\,0,\,1). The corresponding energy dispersions fulfill the relation $ε_{1} (k)$ = $- ε_{2} (k \pm Q_{0})$ at eight FS hotspot lines. The spin-orbital characters of the involved $5 f$ states are {\it distinct} ( $j_{z}$ = $\pm$ 5/2 {\it vs.} $\pm$ 3/2) and hence the degenerate Dirac crossings are symmetry protected in the nonmagnetic normal state. Dynamical symmetry breaking through an Ising-like spin and orbital excitation mode with $Δ j_{z}$ = $\pm$ 1 induces a hybridization of the two states, causing substantial FS gapping. Concomitant spin and orbital currents in the uranium planes give rise to a rotational symmetry breaking.

arXiv comment5 pages, 3 figures

Spin and orbital hybridization at specifically nested Fermi surfaces in URu $_{2}$ Si $_{2}$

Abstract

References in corpus (23)

Cited by in corpus (34)

Spin and orbital hybridization at specifically nested Fermi surfaces in URu2​Si2​

Abstract

References in corpus (23)

Cited by in corpus (34)

Spin and orbital hybridization at specifically nested Fermi surfaces in URu $_{2}$ Si $_{2}$